Pass BuildTestsAgainstPackages arg to exclude unix tests

Helix builds xunit wrappers on windows, and runs them on unix. The
BuildTestsAgainstPackages should currently be set to true in the
windows wrapper build to properly filter the .cmd files based on
exclusions in issues.targets.

Author: sbomer

build-test.cmd

@@ -46,6 +46,7 @@ set processedArgs=
 set __unprocessedBuildArgs=
 set __RunArgs=
 set __BuildAgainstPackagesArg=
+set __BuildAgainstPackagesMsbuildArg=
 set __SkipRestorePackages=
 set __SkipManaged=
 set __SkipNative=
@@ -82,7 +83,7 @@ if /i "%1" == "skipmanaged"           (set __SkipManaged=1&set processedArgs=!pr
 if /i "%1" == "skipnative"            (set __SkipNative=1&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
 if /i "%1" == "buildtesthostonly"     (set __SkipNative=1&set __SkipManaged=1&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
 if /i "%1" == "toolset_dir"           (set __ToolsetDir=%2&set __PassThroughArgs=%__PassThroughArgs% %2&set processedArgs=!processedArgs! %1 %2&shift&shift&goto Arg_Loop)
-if /i "%1" == "buildagainstpackages"  (set __ZipTests=1&set __BuildAgainstPackagesArg=-BuildTestsAgainstPackages&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
+if /i "%1" == "buildagainstpackages"  (set __ZipTests=1&set __BuildAgainstPackagesArg=-BuildTestsAgainstPackages&set __BuildAgainstPackagesMsbuildArg=/p:BuildTestsAgainstPackages=true&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
 if /i "%1" == "skiprestorepackages"   (set __SkipRestorePackages=1&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
 if /i "%1" == "ziptests"              (set __ZipTests=1&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
 if /i "%1" == "crossgen"              (set __DoCrossgen=1&set processedArgs=!processedArgs! %1&shift&goto Arg_Loop)
@@ -439,7 +440,7 @@ set __msbuildWrn=/flp1:WarningsOnly;LogFile="%__BuildWrn%"
 set __msbuildErr=/flp2:ErrorsOnly;LogFile="%__BuildErr%"
 
 REM Build wrappers using the local SDK's msbuild. As we move to arcade, the other builds should be moved away from run.exe as well.
-call %__DotnetHost% msbuild %__ProjectDir%\tests\runtest.proj /p:BuildWrappers=true !__msbuildLog! !__msbuildWrn! !__msbuildErr! %__msbuildArgs% %TargetsWindowsMsbuildArg% %__unprocessedBuildArgs%
+call %__DotnetHost% msbuild %__ProjectDir%\tests\runtest.proj /p:BuildWrappers=true !__msbuildLog! !__msbuildWrn! !__msbuildErr! %__msbuildArgs% %TargetsWindowsMsbuildArg% %__BuildAgainstPackagesMsbuildArg% %__unprocessedBuildArgs%
 if errorlevel 1 (
     echo Xunit Wrapper build failed
     exit /b 1